That is an issue of Windows 10 itself.
Or rather, the way CMUD is processing the URL.
For some reason, it seems to bypass what the default program should be.
I have tried to prevent this behavior by removing edge from my system, and now URLs do nothing when clicked on.
I much prefer chrome myself.

All I can do is say what CMUD is doing, and CMUD looks at the file association. Specifically, CMUD looks at the registry key HKEY_CLASSES/.htm and then extracts the \shell\open\command value from that key. So, you can check your own Registry to see what your keys are set to.

I don't have a Windows 10 installation set up to test with atm, so I can't say if there's been any registry changes that could affect this. What I would suggest is:
- Follow these instructions to ensure that Chrome is set as the default program for the ".htm" file extension
- Check the value of the HKEY_CLASSES/.htm registry key and update it to point to Chrome if necessary. As with any registry modifications, I would highly suggest taking a backup first just in case.